Using method of thermoprinting machine for roller type matrix to round surface product

Abstract

The invention relates to the technical field of hot stamping equipment, and discloses a method for using a roller type matrix to round surface product hot stamping machine which comprises a three-synchronous system, a dynamic compensation mechanism, a control system, a sub-mold roller and a pressure compensation system. According to the using method of the hot stamping machine for the round surface product through the roller type matrix, the type matrix roller and the product deform synchronously, a single character can be replaced independently (the cost is reduced by more than 60%), and composite positioning is achieved through laser ranging and an encoder, so that compared with the curved surface hot stamping precision + / -1.2 mm of traditional equipment, the curved surface hot stamping precision is controlled to be + / -0.15 mm, the service life of the type matrix is larger than 500,000 times and is 10 times that of a flexible plate, and the use effect is good. The device can adapt to the diameter range of phi 15-phi 80 mm, and mechanical adjustment is not needed.

Description

Technical Field

[0001] The present invention relates to the technical field of hot stamping equipment, and specifically to a method for using a cylinder die stamping machine for circular surface products. Background Art

[0002] Hot stamping technology is a printing process that transfers metal foil or special pigments onto the surface of a substrate by heating. It is commonly used in fields such as packaging, decoration, and identification. It can endow products with metallic luster, special colors, or patterns, enhancing the visual effect and added value of products. II. Design and Application of Cylinder Dies A cylinder die is a key component in a hot stamping machine, usually made of metal or synthetic materials, with the required characters, patterns, or textures engraved or carved on its surface. During the hot stamping process, the cylinder die rotates and contacts the substrate, transferring the metal foil or pigment onto the substrate. The design of the cylinder die needs to consider various factors, including font size, pattern complexity, hot stamping pressure, temperature control, etc. At the same time, the accuracy and durability of the cylinder die are also important factors affecting the hot stamping quality. Existing hot stamping technologies have problems such as circumferential misalignment (>±1.5 mm) in the curved surface equipment transformed from flat hot stamping machines, peeling of the hot stamping layer due to uneven contact pressure between the traditional die and the curved surface (defect rate 15%-30%), inability to achieve continuous multi-color overprinting (at most single color in the existing technology), and poor adaptability of the diameter of cylindrical products (frequent die replacement). Therefore, this application now proposes a printing process that transfers metal foil or special pigments onto the surface of a substrate by heating. Summary of the Invention

[0003] (I) Technical Problems to be Solved In view of the deficiencies of the prior art, the present invention provides a method for using a cylinder die stamping machine for circular surface products, which has the advantage of synchronous deformation of the die cylinder and the product, and solves the problems of circumferential misalignment in the curved surface equipment transformed from flat hot stamping machines and the inability to achieve continuous multi-color overprinting in the existing technology.

[0004] (II) Technical Solutions To achieve the above object, the present invention provides the following technical solutions: A method for using a cylinder die stamping machine for circular surface products, including a three-synchronization system, a dynamic compensation mechanism, a control system, a sub-die cylinder, and a pressure compensation system. The specific steps are as follows: S1. Select a suitable cylinder die and ensure its correct installation on the cylinder shaft of the hot stamping machine; S2. Adjust the temperature, pressure, and speed parameters of the hot stamping machine according to the material and size of the circular surface product; S3. Start the three-synchronization system, and the cylinder die, conveyor belt, and heating element move synchronously; S4. Place the circular surface product on the conveyor belt and start the hot stamping machine; S5. The control system monitors the operating status of the hot stamping machine and adjusts parameters as needed to maintain the hot stamping quality; S6. The dynamic compensation mechanism adjusts the position and pressure of the drum die in real time to compensate for deviations caused by factors such as thermal expansion of the material; S7. After hot stamping is completed, the control system stops the hot stamping machine and sends a signal to prompt the operator to collect the finished products; S8. After hot stamping is completed, collect the finished products and conduct quality inspection to ensure the clarity and consistency of the hot stamping pattern, and further cut and trim the finished products.

[0005] Preferably, the three-synchronization system includes a main drive drum, a die drum, and a product conveying wheel set. The surface hardness of the main drive drum is HRC60 - 65. The die drum adopts a modular inlay structure, and the product conveying wheel set is internally provided with a vacuum adsorption channel. The surface hardness of the main drive drum reaches HRC60 - 65. This high-hardness material can resist wear and deformation during hot stamping, ensuring long-term stable hot stamping quality.

[0006] Preferably, the dynamic compensation mechanism includes a hydraulic radial floating device, a curvature adaptive gasket, and an optical encoder. The hydraulic radial floating device allows the drum die to perform radial floating adjustment according to the curvature of the circular surface product during hot stamping. Through the action of hydraulic pressure, the contact pressure between the drum die and the product surface can be adjusted in real time to ensure uniform hot stamping.

[0007] Preferably, the control system includes a servo synchronization controller, a temperature-pressure coupling adjustment module, and a product diameter automatic recognition system. The servo synchronization controller is responsible for precisely controlling the synchronous movement of the main drive drum, the die drum, and the product conveying wheel set. Through high-precision servo motors and encoder feedback, precise speed matching and position synchronization among the three are achieved, ensuring the accurate transfer and positioning of the hot stamping pattern, ensuring that the drum die and the circular surface product always maintain the correct relative position during hot stamping, and avoiding misalignment or blurring of the hot stamping pattern.

[0008] Preferably, the sub-module drum consists of 64 independent character modules forming a circumference, with built-in micro heating tubes. Each of the 64 independent modules in the sub-module drum can be quickly disassembled and assembled. The partition temperature control accuracy of the micro heating tubes is ±2°C. The sub-module drum is composed of 64 independent and replaceable character modules, which are evenly distributed on the circumference of the drum. Each character module is engraved with specific characters, patterns or textures, and can be selected and combined according to the hot stamping requirements. This modular design makes it very simple and fast to replace the character mold, eliminating the need to replace the entire drum, reducing costs and improving efficiency. Inside each independent character module, there is a built-in micro heating tube. These heating tubes precisely control the temperature to ensure that the metal foil or coloring material can be evenly and quickly transferred to the round surface product during the hot stamping process. The design of the micro heating tubes enables each character module to be heated independently, thus achieving precise control of the hot stamping temperature and avoiding hot stamping quality problems caused by uneven temperature.

[0009] Preferably, the pressure compensation system adopts three-stage pressure regulation, where: Primary pressure compensation: Cylinder preloading, with a pressure range of 0.2 - 0.5 MPa Secondary pressure compensation: Hydraulic fine adjustment, with a pressure range of 0 - 20 μm micro displacement Tertiary pressure compensation: Elastic gasket deformation compensation; Primary pressure compensation mainly provides pre-pressure through a cylinder, pressing the drum character mold tightly against the round surface product. This step is the initial stage of the hot stamping process, ensuring the basic contact between the drum character mold and the product surface. The pressure range of the cylinder preloading is set at 0.2 - 0.5 MPa. This pressure range can ensure the tight contact between the drum character mold and the product surface, and will not cause material damage or deformation due to excessive pressure. On the basis of the cylinder preloading, secondary pressure compensation is precisely adjusted through a hydraulic system. The hydraulic system features high precision and high sensitivity, and can achieve precise compensation for the tiny gap between the drum character mold and the product surface. The pressure range of the hydraulic fine adjustment shows a micro displacement of 0 - 20 μm, which means that the hydraulic system can achieve a tiny adjustment of the position of the drum character mold to compensate for the deviation caused by factors such as material thermal expansion and mechanical errors. This fine adjustment ability ensures the precise alignment and positioning of the hot stamping pattern. Tertiary pressure compensation uses an elastic gasket as the final compensation means. The elastic gasket is usually made of a high-elastic material and can deform according to the actual contact situation between the drum character mold and the product surface, thereby further compensating for the uneven pressure distribution. During the hot stamping process, the elastic gasket will deform according to the contact pressure between the drum character mold and the product surface. This deformation can absorb and disperse part of the pressure, making the pressure distribution more uniform. At the same time, the deformation of the elastic gasket can also compensate for the tiny gap caused by factors such as material thermal expansion, ensuring the clarity and consistency of the hot stamping pattern.

[0010] Compared with the prior art, the present invention provides a method for using a drum letter mold hot stamping machine for circular surface products, which has the following beneficial effects: 1. In the method for using a drum letter mold hot stamping machine for circular surface products, the letter mold drum and the product are deformed synchronously, and individual characters can be independently replaced (cost reduced by more than 60%). The composite positioning of laser ranging + encoder is adopted. Compared with the traditional equipment, the curved surface hot stamping accuracy is ±1.2 mm, while the curved surface hot stamping accuracy of this application is controlled within ±0.15 mm. The letter mold life is greater than 500,000 times, which is 10 times that of flexographic plates, and it can adapt to a diameter range of Φ15 - Φ80 mm without mechanical adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic flow chart of the method for using the hot stamping machine of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0013] Embodiment 1: A method for using a drum letter mold hot stamping machine for circular surface products includes a three-synchronization system, a dynamic compensation mechanism, a control system, a sub-mold drum, and a pressure compensation system. The specific steps are as follows: S1. Select a suitable drum letter mold and ensure its correct installation on the drum shaft of the hot stamping machine; S2. Adjust the temperature, pressure, and speed parameters of the hot stamping machine according to the material and size of the circular surface product; S3. Start the three-synchronization system, and the drum letter mold, conveyor belt, and heating element move synchronously; S4. Place the circular surface product on the conveyor belt and start the hot stamping machine; S5. The control system monitors the operating state of the hot stamping machine and adjusts the parameters as needed to maintain the hot stamping quality; S6. The dynamic compensation mechanism adjusts the position and pressure of the drum letter mold in real time to compensate for the deviation caused by factors such as material thermal expansion; S7. After the hot stamping is completed, the control system stops the hot stamping machine and sends a signal to prompt the operator to collect the finished product; S8. After the hot stamping is completed, collect the finished product and conduct quality inspection to ensure the clarity and consistency of the hot stamping pattern, and further cut and trim the finished product.

[0014] Embodiment 2: The three-synchronization system includes a main drive roller, a die roller, and a product conveying wheel set. The surface hardness of the main drive roller is HRC60-65. The die roller adopts a modular inlay structure. The product conveying wheel set is internally provided with a vacuum adsorption channel. The surface hardness of the main drive roller reaches HRC60-65. This high-hardness material can resist wear and deformation during the hot stamping process, ensuring long-term stable hot stamping quality. The main drive roller is the power source of the hot stamping machine, and through an accurate transmission mechanism, it transmits power to the die roller and the product conveying wheel set to achieve synchronous movement of the three. As the core component of the system, the main drive roller is responsible for driving the entire hot stamping process. Its high precision and high stability ensure the accurate transfer and positioning of the hot stamping pattern. The dies can be easily replaced or adjusted to meet different hot stamping requirements. The dies on the die roller are usually made by high-precision engraving technology to ensure the clarity and consistency of the hot stamping pattern. The die roller moves synchronously with the main drive roller and accurately transfers the hot stamping pattern to the cylindrical product. The modular design greatly enhances the flexibility of the hot stamping machine and can adapt to a variety of different hot stamping tasks. The vacuum adsorption channel provided inside the product conveying wheel set can firmly adsorb the cylindrical product to prevent displacement or dropping during the hot stamping process. Through an accurate conveying mechanism, the product conveying wheel set can smoothly convey the cylindrical product to the hot stamping position and keep synchronous with the die roller. The product conveying wheel set ensures the stability and accuracy of the cylindrical product during the hot stamping process. The vacuum adsorption function enables the product to closely adhere to the conveying wheel set, avoiding hot stamping errors caused by movement or vibration. The three-synchronization system realizes precise control of the hot stamping process by precisely controlling the synchronous movement of the main drive roller, the die roller, and the product conveying wheel set. This synchronization ensures the accurate transfer and positioning of the hot stamping pattern, while improving the production efficiency and hot stamping quality of the hot stamping machine. In addition, the modular design and the vacuum adsorption function make the hot stamping machine have stronger flexibility and adaptability, and can meet a variety of different hot stamping requirements.

[0015] Embodiment 3: The dynamic compensation mechanism includes a hydraulic radial floating device, a curvature adaptive pad, and an optoelectronic encoder. The hydraulic radial floating device allows the drum die to perform radial floating adjustment according to the curvature of the cylindrical surface product during the hot stamping process. Through the action of hydraulic pressure, the contact pressure between the drum die and the product surface can be adjusted in real time to ensure uniform hot stamping. The curvature adaptive pad is located between the drum die and the hydraulic radial floating device and is made of an elastic material. It can deform according to the curvature change of the cylindrical surface product, thereby maintaining close contact between the drum die and the product surface and improving the accuracy and consistency of hot stamping. The optoelectronic encoder is used to monitor the rotation position and speed of the drum die in real time. By connecting to the control system, the movement of the drum die can be accurately controlled to ensure the accurate alignment and positioning of the hot stamping pattern; The method of using the drum die of the cylindrical surface product hot stamping machine combined with the dynamic compensation mechanism realizes the adaptive adjustment of the curvature of the cylindrical surface product and high-precision hot stamping through the synergistic effect of the hydraulic radial floating device, the curvature adaptive pad, and the optoelectronic encoder. This method improves the accuracy and consistency of hot stamping and meets the diverse hot stamping requirements.

[0016] Example 4: The control system includes a servo synchronization controller, a temperature-pressure coupling regulation module, and a product diameter automatic recognition system. The servo synchronization controller is responsible for precisely controlling the synchronous movement of the main drive roller, the die roller, and the product conveyor wheel set. Through high-precision servo motors and encoder feedback, precise speed matching and position synchronization among the three are achieved, ensuring the accurate transfer and positioning of the hot stamping pattern, ensuring that the die on the roller and the round product always maintain the correct relative position during the hot stamping process, avoiding misalignment or blurring of the hot stamping pattern. By adjusting the output of the servo motor in real time, minute deviations caused by factors such as load changes and mechanical wear are compensated, maintaining the stable operation of the system. The temperature-pressure coupling regulation module is responsible for monitoring and adjusting the heating temperature and the pressure applied to the die roller during the hot stamping process in real time. This module feeds the real-time data back to the control system through integrated temperature sensors and pressure sensors. The control system automatically adjusts the power of the heating element and the working pressure of the hydraulic radial floating device according to the preset hot stamping parameters and the feedback data. By precisely controlling the temperature and pressure, it ensures that the metal foil or colorant can be evenly and firmly transferred onto the round product, improving the clarity and adhesion of the hot stamping pattern. The heating power is adjusted according to actual needs to avoid energy waste and reduce material damage caused by excessive temperature or pressure. The product diameter automatic recognition system monitors the diameter change of the round product in real time through integrated photoelectric sensors or laser rangefinders. This system can automatically adjust the relevant parameters of the hot stamping machine (such as the radial position of the die roller, the speed of the conveyor belt, etc.) to adapt to products of different diameters. Without manual intervention, it can automatically adapt to round products of different diameters, improving the flexibility and production efficiency of the hot stamping machine, avoiding hot stamping errors caused by improper manual parameter adjustment, and improving the stability and consistency of the hot stamping quality. The control system combining the servo synchronization controller, the temperature-pressure coupling regulation module, and the product diameter automatic recognition system realizes the comprehensive monitoring and precise control of the hot stamping machine for die on round products. This highly integrated control system not only improves the precision and automation level of hot stamping but also reduces the operation difficulty and the risk of human errors, providing a strong guarantee for producing high-quality and high-efficiency hot stamping products.

[0017] Example Five: The sub-module drum consists of 64 independent word modules forming a circumference, with built-in micro heating tubes. In the 64 independent modules of the sub-module drum, a single module can be quickly disassembled and assembled. The partition temperature control accuracy of the micro heating tubes is ±2°C. The sub-module drum is composed of 64 independent and replaceable word modules, which are evenly distributed on the circumference of the drum. Each word module is engraved with specific characters, patterns or textures, and can be selected and combined according to the hot stamping requirements. This modular design makes it very simple and fast to replace the word mold, without the need to replace the entire drum, reducing costs and improving efficiency. Inside each independent word module, there is a built-in micro heating tube. These heating tubes ensure that the metal foil or colorant can be evenly and quickly transferred to the circular surface product during the hot stamping process by precisely controlling the temperature. The design of the micro heating tubes enables each word module to be heated independently, thus achieving precise control of the hot stamping temperature and avoiding hot stamping quality problems caused by uneven temperature. Due to the modular design, the sub-module drum can easily replace the word modules to meet different hot stamping requirements. Whether it is replacing the font, pattern or texture, it can be completed in a short time, greatly improving the flexibility of the hot stamping machine. The built-in micro heating tubes enable each word module to be heated independently, thus achieving precise control of the hot stamping temperature. This precise temperature control ensures the clarity and consistency of the hot stamping pattern, avoiding hot stamping quality problems caused by uneven temperature. The combination of the modular design and the micro heating tubes makes the hot stamping process more efficient. Replacing the word modules and adjusting the temperature can be completed in a short time, thus improving the production efficiency of the hot stamping machine. At the same time, since each word module can be heated independently, the hot stamping of different areas can be carried out simultaneously, further improving the efficiency.

[0018] Embodiment Six: The pressure compensation system adopts three-stage pressure regulation, where: First-stage pressure compensation: Cylinder preloading, pressure range is 0.2 - 0.5 MPa Second-stage pressure compensation: Hydraulic fine-tuning, pressure range is 0 - 20 μm micro displacement Third-stage pressure compensation: Elastic gasket deformation compensation; The primary pressure compensation mainly provides a pre-pressure through a cylinder to tightly press the drum die onto the circular surface product. This step is the initial stage of the hot stamping process, ensuring the basic contact between the drum die and the product surface. The pressure range of the cylinder pre-pressure is set at 0.2 - 0.5 MPa. This pressure range can not only ensure the tight contact between the drum die and the product surface but also prevent material damage or deformation caused by excessive pressure. On the basis of the cylinder pre-pressure, the secondary pressure compensation is precisely adjusted through a hydraulic system. The hydraulic system features high precision and high sensitivity and can achieve precise compensation for the tiny gaps between the drum die and the product surface. The pressure range of the hydraulic fine-tuning is represented by a micro-displacement of 0 - 20 μm, which means the hydraulic system can achieve minor adjustments to the position of the drum die to compensate for the deviations caused by factors such as material thermal expansion and mechanical errors. This fine-tuning ability ensures the precise alignment and positioning of the hot stamping pattern. The tertiary pressure compensation uses an elastic gasket as the final compensation means. The elastic gasket is usually made of a highly elastic material and can deform according to the actual contact situation between the drum die and the product surface, thereby further compensating for the uneven pressure distribution. During the hot stamping process, the elastic gasket will deform according to the contact pressure between the drum die and the product surface. This deformation can absorb and disperse part of the pressure, making the pressure distribution more uniform. At the same time, the deformation of the elastic gasket can also compensate for the tiny gaps caused by factors such as material thermal expansion, ensuring the clarity and consistency of the hot stamping pattern.

[0019] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for using a roller die stamping machine for round surface products, characterized in that: It includes three synchronization systems, dynamic compensation mechanism, control system, sub-mold roller, and pressure compensation system. The specific steps are as follows: S1. Select a suitable roller type mold and ensure that it is correctly installed on the roller shaft of the hot stamping machine; S2. Adjust the temperature, pressure and speed parameters of the hot stamping machine according to the material and size of the round product; S3, start the three-synchronous system, and the roller mold, conveyor belt and heating element move synchronously; S4, placing the round product on the conveyor belt and starting the hot stamping machine; S5, the control system monitors the operating status of the hot stamping machine and adjusts parameters as needed to maintain the hot stamping quality; S6, dynamic compensation mechanism adjusts the position and pressure of the roller die in real time to compensate for the deviation caused by factors such as thermal expansion of the material; S7, after the hot stamping is completed, the control system stops the hot stamping machine and sends a signal to prompt the operator to collect the finished product; S8. After hot stamping is completed, the finished products are collected and quality checked to ensure the clarity and consistency of the hot stamping pattern, and the finished products are further trimmed and cut.

2. The method for using a roller type mold hot stamping machine for round surface products according to claim 1, characterized in that: The three-synchronous system includes a main drive roller, a mold roller, and a product conveying wheel group, wherein the surface hardness of the main drive roller is HRC60-65, the mold roller adopts a modular mosaic structure, and a vacuum adsorption channel is provided inside the product conveying wheel group.

3. The method for using a roller type mold hot stamping machine for round surface products according to claim 1, characterized in that: The dynamic compensation mechanism comprises a hydraulic radial floating device, a curvature adaptive pad, and a photoelectric encoder.

4. The method for using a roller type mold hot stamping machine for round surface products according to claim 1, characterized in that: The control system includes a servo synchronous controller, a temperature-pressure coupling adjustment module, and a product diameter automatic identification system. The servo synchronous controller is responsible for accurately controlling the synchronous movement of the main drive roller, the mold roller, and the product conveying wheel group, and realizes accurate speed matching and position synchronization among the three through high-precision servo motor and encoder feedback.

5. The method for using a roller type mold hot stamping machine for round surface products according to claim 1, characterized in that: The sub-mold roller is composed of 64 independent sub-modules forming a circumference, and has a built-in micro-heating tube. A single module of the 64 independent modules of the sub-mold roller can be quickly disassembled and assembled, and the zone temperature control accuracy of the micro-heating tube is ±2°C.

6. The method for using a roller type mold hot stamping machine for round surface products according to claim 1, characterized in that: The pressure compensation system adopts three-stage pressure regulation, wherein: First-stage pressure compensation: cylinder pre-pressure, pressure range is 0.2-0.5MPa Secondary pressure compensation: hydraulic fine adjustment, pressure range is 0-20μm micro displacement Three-level pressure compensation: elastic pad deformation compensation.

Images